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Use these docs for exact setup steps, supported fields, and troubleshooting.
Tremendous fulfills GrowSurf referral rewards as gift cards. When a participant unlocks a connected reward, GrowSurf emails them a Tremendous reward and they choose what they want from hundreds of brands — you do not pick the brand for them.
There is no Tremendous signup to do first and no API key to copy. You start the connection from the GrowSurf integrations list.
Tremendous fulfills referral program rewards. For affiliate commission payouts, use Wise or PayPal.

Open the Tremendous card, select Connect to Tremendous, and choose the currency for the account: USD, EUR, or GBP. Fill in the company details Tremendous asks for and add a payment method — GrowSurf never sees your card — then come back and select Refresh.
Tremendous reviews every new account before it can send anything, usually a business day or two. The card shows where the review stands. Set up your rewards while you wait.

Connecting Tremendous creates one account for your GrowSurf team. Every program on the team shares that account and that balance, so the second program is a single Turn on for this program click — no second signup, no second funding.
Select Connect a Reward, pick the reward Tremendous should fulfill, choose who gets the gift card, and set the amount and currency. The currency starts as your program’s currency. On a double-sided reward the referrer and the referred friend can each have a different amount and currency. Amounts can include cents where the currency supports them.
If different referral outcomes should be worth different amounts, dynamic rewards let you vary the value by attributes of the referrer or the referred friend.
Select Add Funds on the Tremendous card. That opens Tremendous, where you add money and manage payment methods. Gift cards and prepaid cards cost face value with no Tremendous fee.
The winner gets an email with the amount and a redemption button.

Opening it lands them on the Tremendous redemption page.

There they choose a gift card or a prepaid Virtual Visa. Winners see the gift cards available in their own country, and Tremendous handles currency conversion when it is needed.
Approval takes a business day or two, but reward configuration does not depend on it. Do that work first and the program is ready the moment the account clears.
You can run Tremendous and Tango Card on the same program, but not on the same reward — the winner would receive it twice.
If Tax Forms and 1099 filing are enabled, the gift card amount goes into the winner’s yearly total and the reward is held until they have a W-9 or W-8 on file.
No. Select Connect to Tremendous in GrowSurf and you create the account as part of setup.
No. Once your team is connected, other programs turn Tremendous on with one click and share the same balance.
No, and that is the point. The winner picks from hundreds of brands or takes a prepaid Virtual Visa, which is why redemption rates hold up across countries.
The reward stays available until it expires and the funds stay in your balance. The reward email shows the expiration date.
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